[jira] [Commented] (ARROW-491) [C++] Add FixedWidthBinary type

["Julien Le Dem (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15927204#comment-15927204 ] 

Julien Le Dem commented on ARROW-491:
-------------------------------------

So, from the layout perspective, there's just one vector with fixed width values of `byteWidth` and a validityVector .
Sounds good to me.

> [C++] Add FixedWidthBinary type
> -------------------------------
>
>                 Key: ARROW-491
>                 URL: https://issues.apache.org/jira/browse/ARROW-491
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Wes McKinney
>
> This would be very useful for interacting with Parquet and other data sources that use fixed-byte-width binary types, as a more efficient version of List<UInt8>. We can resolve adding this type to the format spec later.
> [~julienledem] [~nongli] do you have an opinion about this type? Would be equivalent to FIXED_LEN_BYTE_ARRAY in Parquet. It would be convenient to implement Decimal types on top of this



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